Description
The Milwaukee-Eight® engine demands precision engineering to maintain reliable valve train operation under load and high RPM conditions. Factory rocker arm shafts can accumulate wear, leading to valve timing drift and reduced engine efficiency. The JIMS Rocker Arm Shaft Kit restores exact tolerances and geometry, delivering consistent performance and extended engine life.
Built from case-hardened low alloy steel reinforced with nickel, chromium, and molybdenum, these shafts are engineered to resist wear and fatigue in demanding riding conditions. Each component is precision-machined to exacting specifications—hardware flats held to .0005″ parallel tolerance—ensuring perfect seating and eliminating the guesswork from valve train alignment. Installation is straightforward, making this a practical upgrade for riders seeking reliability without compromise.
- Fitment: 2018-2022 Harley-Davidson FLFBS Fat Boy 114
- Material: Case-hardened low alloy steel
- Alloy composition: Nickel, chromium, molybdenum
- Hardware tolerance: .0005″ parallel
- Installation: Bolt-on
- Benefit: Optimized valve train geometry
- Engine type: Milwaukee-Eight®
- Manufacturer part number: 5837
